electrical out help needed- XMAS

ok, the outlet I plug in my Christmas lights is no longer working.

I checked the breaker panel and nothing is tripped and reset the breaker anyway. I have a lot of GFI receptacles in my yard....maybe one of those got tripped, but circuit in back is working and I didn't find any tripped unless I missed one. I didnt get Clark Griswalded and somone turned off an unknown light switch that operates the outlet.......any thoughts?

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RIP Bucky - 7/25/1943 - 1/19/2013